Updated Article: The walnut app for iPhone is available and it is called WalnutPay. You can directly download it on your iPhone from the iTunes Store on your iPhone. It compatible with iPhone, iPad, and iPod touch. Any device with iOS 8.0 or below version will not be supported.
Can I Download Walnut App for iPhone ?
At this time, Walnut App is available for android only. However, due to the simplicity and effectiveness of the app, the developing team may consider publishing walnut app for iPhone. When, I reviewed Walnut Website, it is mentioned as "Walnut is available for android only". They have not mentioned any information about future release of walnut for iPhone. However, they do not have exact time of when it will be launched. As walnut expense tracker for ios is not available, you can search for any other expense manager and use it.
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Walnut App for iPhone